Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e8835a9c7faedc…

MALICIOUS

PDF

50.8 KB Created: 2020-08-23 00:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c6e3bd36d29568708d4c519a6001e6 SHA-1: 56bc439da2c3b1c4d21ef91ea5d03802c1b91aba SHA-256: 31e8835a9c7faedc90d63c32dac4dfb64c6f2d7cd13bfa5cdc2c9de35bf20e69
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the same as the one identified by the redirector heuristic. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=diagnosis+banding+angina+pectoris+pdf
    • http://wexoka.arkansascloggingcouncil.com/uploads/1/3/0/7/130776819/kezademex-wikuwiri.pdf
    • http://files.guadalupecardona.com/uploads/1/3/1/4/131406736/4770910.pdf
    • http://files.nixonholdings.com/uploads/1/3/2/6/132681992/bokexegukexugutuwu.pdf
    • http://zikux.coloradocollaborative.org/uploads/1/3/0/8/130874540/topaxovigol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2870/7485/files/sarumomoximevurux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7017/files/45910132591.pdf
    • https://cdn.shopify.com/s/files/1/0428/5123/8047/files/7th_grade_math_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0448/5667/2418/files/bubba_sparxxx_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/luigi_s_mansion_dark_moon_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/c_binary_tree_implementation.pdf
    • https://cdn.shopify.com/s/files/1/0465/5277/6862/files/platform_lace_up_chunky_heel_ankle_boots.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/gukivotidopi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/wezikijinajuzepar.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/community_ecology_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087b3.bin
65b014cb24e101787484a8a35287bf7f24a8f33eb3d6a64b31601b9a3477de2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x87B3 5428 bytes
font_01_sfnt_off00009a34.bin
36eea259e8da022c626b1a3134b2e3f102493ee63b8f18bfcaf74784a80ccdc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A34 10488 bytes